CVE-2025-8707

Executive Summary

CVE-2025-8707 is a security advisory concerning the Huuge Box App version 1.0.3 on the Android platform. The vulnerability is classified as problematic and involves improper export of Android application components, specifically within the com.huuge.game.zjbox component as defined in the AndroidManifest.xml file. This misconfiguration can lead to unauthorized access to exported components by other applications on the same device, potentially allowing data leakage or unintended functionality exposure. The attack requires local access, meaning an attacker must have a malicious app installed on the same device to exploit this vulnerability. The exploit has been publicly disclosed, increasing the risk of targeted attacks. No patch information is currently available from the vendor.

Supply Chain & Package Security

This vulnerability is not related to a package manager (NPM, PyPI, Go, Ruby) but is an Android application security issue. The risk is primarily to end-users who install the Huuge Box App from unofficial sources or who have other malicious applications on their device.

CVSS Breakdown & Threat Level

The CVSS v3.1 base score is 5.3 (Medium).

• Attack Vector (AV): Local (AV:L) - The attacker must have local access to the device.
• Attack Complexity (AC): Low (AC:L) - No special conditions are required for exploitation.
• Privileges Required (PR): None (PR:N) - No privileges are needed to exploit the vulnerability.
• User Interaction (UI): None (UI:N) - The victim does not need to perform any action.
• Scope (S): Unchanged (S:U) - The impact is confined to the vulnerable component.
• Confidentiality (C): Low (C:L) - Limited information disclosure is possible.
• Integrity (I): Low (I:L) - Limited modification of data is possible.
• Availability (A): None (A:N) - No impact on availability.

Threat Level: Medium. The requirement for local access reduces the attack surface, but the public availability of exploit details and the lack of a patch make this a credible threat for users of the app.

Deep Dive & Mechanics

The vulnerability stems from improper configuration of Android application components in the AndroidManifest.xml file. In Android, components such as Activities, Services, Broadcast Receivers, and Content Providers can be exported (made accessible to other apps) by setting the android:exported="true" attribute. If a component is exported without proper permission checks or intent filters, any other application on the device can interact with it.

In the case of CVE-2025-8707, the com.huuge.game.zjbox component is exported without adequate protection. This could allow a malicious app to:

• Launch the component directly, bypassing intended UI flows.
• Send intents to the component, potentially triggering unintended actions.
• Access data or functionality that should be restricted to the Huuge Box App itself.

The specific impact depends on the functionality of the exported component. It could range from displaying unwanted ads to accessing sensitive user data stored by the app.

Vulnerable vs. Patched Code

Since no patch is available, a comparison cannot be made. However, the vulnerable code would be in the AndroidManifest.xml file of the Huuge Box App version 1.0.3.

Vulnerable Configuration (AndroidManifest.xml):

<activity android:name="com.huuge.game.zjbox" android:exported="true">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>

Patched Configuration (Hypothetical):

<activity android:name="com.huuge.game.zjbox" android:exported="false">
    <!-- or -->
    <activity android:name="com.huuge.game.zjbox" android:exported="true" android:permission="android.permission.YOUR_CUSTOM_PERMISSION">
</activity>

The fix would involve either setting android:exported="false" if the component does not need to be accessed by other apps, or implementing a custom permission that other apps must hold to interact with it.

Exploitation & Lab Setup

Red Team

Prerequisites:

• Android device with Huuge Box App 1.0.3 installed.
• A malicious Android app installed on the same device.

Exploitation Steps:

1. Create a simple Android app that sends an intent to the exported component.
2. Use the following code to launch the component:

   Intent intent = new Intent();
   intent.setClassName("com.huuge.game.zjbox", "com.huuge.game.zjbox.MainActivity");
   startActivity(intent);
   

3. Observe the behavior of the Huuge Box App. It may launch a specific activity or perform an unintended action.

Expected Outcome: The malicious app can launch the exported component, potentially bypassing authentication or accessing sensitive functionality.

Blue Team

Detection and Mitigation:

• Monitor for unusual app behavior, such as unexpected launches of the Huuge Box App.
• Use Android's built-in security features to restrict app permissions.
• Educate users to only install apps from trusted sources (Google Play Store).
• Implement runtime checks in the app to verify the caller's identity using getCallingPackage() and validate it against a whitelist.

Lab Setup for Testing:

• Use an Android emulator or a test device.
• Install the vulnerable Huuge Box App version 1.0.3.
• Install a test app that attempts to exploit the exported component.
• Monitor logs using adb logcat to see if the component is accessed.

Indicators of Compromise (IOCs)

• Application Package Name: com.huuge.game.zjbox
• Application Version: 1.0.3
• Exported Component: com.huuge.game.zjbox (Activity)
• Logcat Entry: I/ActivityManager: START u0 {act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.huuge.game.zjbox/.zjbox} from an unexpected package.

Detection Engineering

YARA Rule

rule CVE_2025_8707_Huuge_Box_App_Exported_Component {
    meta:
        description = "Detects Huuge Box App with exported component vulnerability"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-8707"
    strings:
        $manifest = "AndroidManifest.xml"
        $exported = "android:exported=\"true\""
        $component = "com.huuge.game.zjbox"
    condition:
        $manifest and $exported and $component
}

Sigma Rule

title: CVE-2025-8707 - Huuge Box App Exported Component Exploitation
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects attempts to exploit the exported component in Huuge Box App
author: Valters IT
date: 2025-04-10
logsource:
    product: android
    service: logcat
detection:
    selection:
        EventID: 1000
        PackageName: "com.huuge.game.zjbox"
        Action: "android.intent.action.MAIN"
    condition: selection
falsepositives:
    - Legitimate use of the app
level: medium

Suricata Rule

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"CVE-2025-8707 - Huuge Box App Exported Component Exploitation"; flow:to_server,established; content:"com.huuge.game.zjbox"; http_uri; classtype:attempted-user; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the App: Uninstall the Huuge Box App version 1.0.3 until a patch is available.
2. Restrict App Permissions: On Android, go to Settings > Apps > Huuge Box > Permissions and revoke any unnecessary permissions.
3. Monitor Device Activity: Check for any suspicious apps that may be exploiting this vulnerability.

Long-Term Fixes:

• Vendor Patch: The developer must update the AndroidManifest.xml to either set android:exported="false" for the component or implement proper permission checks.
• Code Review: Conduct a security audit of all exported components in the app.
• User Education: Advise users to only install apps from official sources and to be cautious of granting permissions.

Workarounds:

• Use Android's "App Pinning" feature to prevent other apps from interacting with the Huuge Box App.
• Install a mobile security solution that can detect and block exploitation attempts.

Valters IT
Senior DevSecOps & Cyber Threat Intelligence Expert